Lamp-house for moving-picture apparatus



N. POWER.

LAMP HOUSE FOR MOVING PICTURE APPARATUS.

APPLICATION FILED OCT. 12.41915. RENEWED DEC- 1.1920.

Patented July 5, 1921.

8 vwewtoz moHonAs POWER, OF BnooKnYN, NEW YORK, AssIeuoR. 'ro NIoHoLAs ieowEn 7:

; COMPANY, on, EW YORK, n. Y., j

A CORPORATION DELAWARE.

LAMP-never: non movrne-rrorunn APBARATfiSi T all whom iii may concern} I r Be it known'that' I, NIoHoLAs Pownn, a citizen of the United States, and a resident of Brooklyn, in the county of Kings and State of New York, have invented new and useful Improvements in Lamp-Houses for Moving-Picture Apparatus, of which the following is a specification. 1 g 'This 'inventionrelates to lamp houses'for arc lamps of the character used for the pro jection of motion pictures, and hasjfor its object to'provide a lamp house n. wh ch a high poweredarc canxbe used'w th perfect safety and so'designed that no part of the lamp house becomes sufliciently heated l to burn the: operator, or ignite the film in case offaccidental contacttherewith." l

A further object of the invention is to provide a lamp house having attached condensersfor 'focusing the light on the picture stripwhich isso constructed that the condensers are protected from lntense heat and also from rapid changes of temperature when the arc" is extinguished which cause the condensers to break. 7

A further object of-the invention is to pro vide a'lamp house with the above features presenting an attractive appearance and be constructed substant ally throughout offstamped sheet metal and con sequently of low cost.

,Further objects of the invention will pear from thespecifi cation taken in connection with the accompanying drawings wherein I have illustrated a preferred embodiment ofiny invention, it being under-' stood of coursethat the" invention 1s not limited to the details of construction shown anddescribed e 111.50 recited 40' in'the appended claims. H

Figure 1 isa side elevatlon of my1m-' proved lamp house,

Fig. 2 s afvertical longitudinalsection through the lamp house shown in Figg l;

and

in the door construction.

, Tteferrmg now to" the drawings 1n wh1ch like parts are indicated by the same 'charac ters throughout the several views, indicates the metal-base board of the lamp house provided with the usual concave rollers 2. for supporting the lamp house on the trans I verse rods 3 of its stand. The upper por- Fig. 3 is a p'artialtransverse section show Specification of Letters Patent. Patented J l 5 1921 v Application filed October 12, 1915, serial No. 55,408. Renewed December 7 1929; Serial No 429,63

tion ofthe house is -composed pally of sheet metal and comprises a rear wall 4 having suitable holes for 'the'projec-Y doors on each side which constitute; the

. The lamp house preferably is provided with v-- major portion of the side faces, Aboveand below the doors the side walls 8, are provided with a series of ventilatingholes 9' extend ing laterally across theentire widthof the Side Wall and p g into, Channels formed; I I

byithe pieces 10 attached'to the inner face of the walls and' jopen ,attheen'ds so as to: direct the air drawn into the ventilating."

holes by the heat of the lamp, upward ag'alnst the end walls of the lamp housefi The front wall 11 of the-lamp houseis c'omposed'of sheetmetal except for the reinforcing piece 12' for supporting the bracket 13 inrwhich, the condenser lenses Mare mounted in" position fwijth their optical centers in 'a'linement with the crater of the, The lowerportionfofthe front wall'l l projects beyond the {edge of the base l;to provide a'ventilating opening 15 at the Ibot arc.

tom of thejfront' wall. The air. received through the opening 115i is deflected back} wardly between the, are and the condensers by the inclined portion 160f the front wall which joins the lower edge of the piece :12.

Above the Condenser racket the frontgwall "ii is bowed outwardly as shown. at 17 to pro-- vide a'ventilatin'g opening 18.for the admission of air between the sheet metal wall and the front face of the'lpiece 12.v

n An op ening20, is provided in the top wall ofthe lamp house near, the rearedgefor the: egress of the air drawn in-through the above described openingsso that a continuous cur-5 rent of air through the lamp house is main-Q tained when the light is on: The top wall is' protected from the heat off-the lamp by: means of a partition' 21,which extends from the rear, wall to a point near the 'frontofthe;

lamp house whereby allateral current of air; is maintainedv across the. underface' of the top wall serving to preventthe top wall be-[i coming excessively heated. opening '20 is preferably provided witha short chimney 22 for augmenting; the draft through the lamp house and for directing the heated air faces and the arc.

upwardly where it will not cause discomfort to the operator.

The doors of the lamphouse are preferably double walled as indicated in Fig. .8 and are bowed outwardly as shown to increase the distance between their inner sur- The outer wall 28 is provided on its bottom inclined portion with a series of ventilator holes 24 for admitting air to the space between the two walls, which air passes upwardly through a' series of' similar holes 25 in the inclined wall at the top of the door, thus insuring free circula tion of'air which keeps the outer wall of the door from becoming overheated.

' With the development of the motion picture art, and'the increasingpopularity of motion pictures as an entertainment, the

theaters have increased insiz'e, necessitating a muchgreater distance of projection, and the demand'for larger and more brilliant pictures has become such that are lightsof very high power, some using carbons of an inch and a half in diameter, are necessary to secure the desired results. Arc lights of this character generate a large amount'of heat andifin'closed in a lamp house of the ordi nary construction withoutspecial'provisions maintained over the entire inner surface of the outside walls, leaving'no part to become heated .to a dangerous temperature. he

double walled doors constitute substantially the 'entire side walls, except the parts immediately above and below the doors in which the ventilating openings are formed. The 'channelpieces into which the side ventilating holes open direct the air to the end walls of the lamp house, and serve to keep them cool'with the aid of the air received through the openings provided in the rear wall for the adjusting screws and the special ventilating passages, in the front wall. The

partition plate at the top of the lamp house protectsthe top wall from the direct rays of the arc, and also causes the outgoing air.

to pass across the entire length of the lamp house before reachlng' the egress opening.

' 1 The chamber formed bythis plate also adds to the flue length, and as the plate is exposed to the greatest heat of the lamp, it adds greatly to the force of the draft, insuring sufficient circulation at all times.

Another important feature of ;my improved lamp house is the arrangement of the ventilating passages in the front wall. The

arrangement is provided to protect the condenser lens from the heat of the arc and also to prevent their too rapid cooling which is one of the chief causes of breakage. The large amount of air admitted through these openings affords a sufficient absorbing medium to carry off the greater portion of the sensible heat of the arc, but the'lenses vare also heated to a large extent by the radiant heat of the arc, from which they cannot of coursebe protected. The danger of breakage from this heat is not so great while the arc is lighted as when itis extinguished,' for the lamp house, being'hot, will maintain a circulation of air afterthe arc is extinguished, and should this cold air be drawn in large volume o'ver the lenses after the radiant heat of the arc is cut .ofif, they will be cooled so rapidly as to break. For this reason the large ventilatingopening is provided above the lenses." *When the arc is out,' the air cur-,

rents are created chiefly by the hotter metal;

at the top of the lampihouse', and hence pra'ck tically all the air willbe taken in at the upper opening, slowly.

What I claim is I I 1. A lamp house for projectinglamps,

consisting of a housing, doors forming the greater portion of 'its'side walls, said doors allowing the' lenses to embodyingair circulating means,. said walls below said doors being provided with a ventilating opening for the ingress'ofjair, and means. for directing the air received through said opening toward the end walls of the housing, said housing fhavingian egress opening at the top thereof.

2. A lamp house for projecting lamps, consisting of a housing, doors forming the greater portion of its side walls, said doors.

embodying air circulating means, said walls below said doors being provided with a ventilating opening for the ingress of air, said housing having atop wallfprovided with an opening nearone end for the egress of air and an inner top wall spaced'below the outer wall and permitting the passage of air only at the end opposite the 'said egress passage.

8. A lamp house for projecting lamps, consisting of a housing having a lens mounted in its front .wall,said housing having openings for the ingress :of air belowsaid lens and in its front wall above said lens, anda' closure for the top of said lamp house having an opening for the egress of air adjacent the front wall substantially above said openings, said housingbeing so designed that the air entering'through said ingress openings passes vertically upward to ,Isaid egress opening and across the.rearface of the front wall'of the housing. i f

4. A lamp house'for projecting lamps consisting of a housing lnclosing the arc, lenses supported in one vertlcal wall of said housing, said housing having an upper horizontal wall or roof, an air egress opening in said roof ata point remote from said lens supporting wall, a baflle plate supported below said opening and forming an air space between said plate and said roof, an opening in said air space adjacent said lens carrying wall, and air ingress o enings above and below said lens positione to direct the air 10 admitted by said openings across the inside igned at New York city, in the county of New York and State of New-York, this 15th day of September, 1915.

NICHOLAS POWER.

Witnesses:

J. F. SKERRETT, ARTHUR J. LANG.

Correction in Letters Patent No. 1,383,754.

It is hereby certified that in Letters Patent No. 1,383,754, granted July 5, 1921, upon the application of Nicholas Power, of Brooklyn, New York, for an improvement in Lamp-Houses for Moving-Picture Apparatus, an error appears in the printed specification requiring correction as follows: Page 2, lines 122-123, claim 3, strike out the Words substantially above said openings; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Ofiice.

Signed and sealed this 30th day of August, A. D., 1921.

[SEAL KARL FENNING,

Acting Commissioner of Patents. 

